The Ponziane Islands (also known as the Pontine Islands) are an archipelago in the Tyrrhenian Sea, off the coast of the Gulf of Gaeta, about 12 km, with a population of about 4000 inhabitants, which in summer becomes a lot more because of an intense tourist movement. The archipelago comprises six islands divided into two main groups. Group of north-west (belonging administratively to the town of Ponza): Island of Ponza, Palmarola Island, Island Zannone, Island of Gavi. Group of the southeast (belonging administratively to the municipality of Ventotene): Ventotene Island, Island of Santo Stefano. The municipalities of the archipelago, previously belonging to the province of Terra di Lavoro, and after the suppression of this, the province of Naples, were transferred to the province of Littoria, along with the district of Sora, under Fascism. The islands are accessible by ferry or hydrofoil from Formia, Anzio, Terracina, San Felice Circeo and, in summer, also from Ischia, Naples and Pozzuoli.